Dynamo-electric machine.



PATENTED 001 .4, 1904.

C. P. STEINMETZ. DYNAMO ELEGTRIG MACHINE.

APPLICATION FILED APR. 30. 1900.

N0 MODEL.

.Jnventor. charlesp; Steinmetz MQ V fitiy;

Fig.1.

Wises UNITED STATES Patented October 4, 1904.

PATENT OFFICE.

CHARLES P. STEINMETZ, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERALELECTRIC COMPANY, A CORPORATION OF NEIV YORK.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No 771,284, dated October4, 1904.

Application filed April 30, 1900.

To all whom, it inrty concern.-

Be it known that I, CHARLES P. STEINMETZ, a citizen of the UnitedStates, residing at Schenectady, county of Schenectady, State of NewYork, have invented certain new and useful Improvements inDynamo-Electric Machines, of which the following is a specification.

In the inductor-dynamo different inductorpoles are in multiple with eachother magnetically, so that the total magnetic flux divides between thepoles in proportion to their respective reluetances. If the differentpoles are of different reluctances, it will therefore be evident thatthe magnetic flux through the poles will differ. Thus, for example, ifthe armature or the bearings are slightly out of center and theair-gapof the machine therefore larger on one side than on the other themagnetic flux on the side of the larger air-gap will be less than on theside of the smaller airgap, so that if the machine were operated on athree-wire system with one side of the armature feeding one side of thethree-wire system and the other side of the armature the other side ofthe three-wire system the voltages would be permanently unequal. If theinductor is slightly eccentric to its axis of rotation, the air-gap willvary between a maximum and a minimum throughout each revolution, therebycausing a pulsation of magnetic flux corresponding to the speed of themachine. This pulsation not only causes energy losses in the machine,but also gives rise to a pulsation of voltage which when the machinefeeds a three-wire system may become particularly noticeable. Toovercome these difficulties, I propose to arrange the generating-coilsof the machine so that alternate coils are connected to one side of thethree-wire system and the remaining coils to the other side. By thisarrangement although the voltage of individual coils may be varied theyareso grouped together that the voltage on one side of the system isalways equal to that on the other side.

Another means which I may employ for carrying out my invention is toprovide the machine with two independent sets of generat- Serial No.14,791. (No model.)

ing-coils, one set being superposed upon the other.

My invention in its details and mode of application will best beunderstood by reference to the following description, taken inconnection with the accompanying drawings, while its scope will beparticularly pointed out in the claims appended hereto.

Figure 1 represents an embodiment of my invention, and Fig. 2 amodification.

As my invention consists chiefly in the arrangement of generating-coilsfor inductordynamos and does not relate to details of construction it iscapable of clear illustration by means of diagrams. I may observe,however, that it may be embodied in structures widely diverse incharacter, a suitable form of machine being shown, for example, in myPatent No. 594,145, granted November 23, 1897.

In the diagram designated as Fig. 1 two sets of generating-coils l and 2are shown, the coils of each set being arranged alternately with respectto the coils of the other set. The coils of the set 1 are connected inseries with those of the set 2, the free terminals being connected tothe outside mains 3 4L of the three-wire distribution system and thecommon connection to the neutral conductor 0. The inductor operating inconjunction with these coils is indicated at 5.

In Fig. 2 there are two sets of generatingcoils 6 7, as in Fig. 1; butthese coils, unlike those of Fig. 1, are superposed upon each other andnot alternatelyarranged. The coils of one set therefore give rise to thesame voltages as the coils of the other set, so that when the voltage ofthe coils of one set varies the voltage of the other set variescorrespondingly. The voltages impressed upon the two sides of thethree-wire system 8 9 10 therefore maintain an equality regardless ofwhether the inductor sags in its bearings or otherwise gets out of linewith its cooperating member.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. In an inductor-alternator, the combination of an inductor and twosets of coils relatively movable with respect to the inductor and allacted upon by the same poles of the inductor, the coils of one set beingalternately arranged with respect to the coils of the other set.

2. In an inductor-alternator, the combination of two sets ofgenerator-coils in substantially the same plane the individual coils ofone set being arranged alternately with respect to the coils of theother set.

3. In an inductor-alternator, the combination of an inductor, and twosets of generator-coils acted upon by the same poles of the inductor andso arranged with respect to the inductor that the voltage of one setbears a definite relation to that of the other set regardless of theposition of the inductor.

4. The combination of an inductor-alternator provided with two sets ofgeneratorcoils lying in substantially the same plane, the coils of oneset being arranged alternately with respect to the coils of the otherset, and a three-wire system fed by said coils.

5. The combinaton of an inductor-alternator provided with an inductorand sets of generator-coils of the same phase acted upon by the samepoles of the inductor and arranged so that the voltage of one set bearsa definite relation to that of another set regardless of the position ofthe inductor, and a three-wire system fed by said coils.

6. The combination of an inductor-alternator provided with an inductorhaving a circularly-arranged set of poles and two sets of coilsinductively related to said set of poles, the coils of each set beingarranged symmetrically with respect to said poles, and a three- Wiresystem connected to said coils.

7. In an inductor-alternator, the combina CHARLES P. STEINMETZ.

lVitnesses:

BENJAMIN B. HULL, ALEX. F. MAoDoNALD.

